Sudoku Verifier
Would you like to verify that your Sudoku is a valid puzzle? - Perhaps you have been struggling for hours on a puzzle and it may turn out to be unsolvable!-
Use this application to verify any sudoku (it will also give you the solution!).
But if you wish, you can just verify that your puzzle is solvable so you don't go insane.
Here are screen shots of the program - it's very easy to use...
Merely enter the puzzle on the left and press the "Solve" button.
If it's solvable you will get the answer - otherwise, you will be alerted that it is unsolvable.
Sudoku Verifier Screen Shots

As you can see, we entered the puzzle on the left and pressed "SOLVE"
The answer was revealed on the Right.
Download the program.
You will be asked where do you want to save it? - I would suggest your desktop however, wherever you save it, please remember the location so you can run it whenever you wish.
Thanks and good luck!
Peter